generate barcode image vb.net Part II in Visual C#

Creator UPC-A Supplement 5 in Visual C# Part II

Part II
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Working with Activities
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Creating the QuestionFlow workflow using the IfElse Activity 1. Open Visual Studio, and open the Questioner application s solution from the book samples. You ll find the solution in \Workflow\ 9\IfElse Questioner. Simply click File, then Open, and then finally Project/Solution. Using the resulting Open Project dialog box, browse your computer s file system until you find Questioner.sln and click Open. 2. Scanning Visual Studio Solution Explorer, you should see a solution layout similar to the one from the previous chapter. The main application files are located in the Questioner project, while the host communication service files are located in the QuestionService project. So that you can concentrate on the workflow aspects of this application, I have already created the service interface, IQuestionService, and executed the wca.exe tool to create the necessary communication activity, SendReponseDataToHost. To begin, locate the QuestionFlow project and open the Workflow1.cs file for editing in the Visual Studio workflow visual designer. Select Workflow1.cs in Solution Explorer, and then click the View Designer toolbar button as you have in previous chapters. 3. When Workflow1 is ready for editing in the workflow visual designer, drag an IfElse activity from the Toolbox to the designer s surface and drop it. This inserts an IfElse activity item into your workflow.
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4. The exclamation mark (!) you see, outlined by the red circle, tells you that more information is required to compile your workflow. In fact, what s missing is the conditional expression itself! Select the left branch of ifElseActivity1 to bring the activity s properties into the Visual Studio Properties pane. Select Condition to activate the dropdown list, and from the list select Code Condition.
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9
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Logic Flow Activities
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You actually have two choices for conditional expressions: code and rulesbased. We ll use the code-based conditional expression here, saving the rules-based technique for 12, Policy Activities.
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5. Expand the resulting Condition property, type in the value AskQuestion1, and press Enter. Visual Studio inserts the AskQuestion1 event handler for you and switches to code view. For now, return to the workflow visual designer so that you can drag more activities into your workflow.
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6. With the Visual Studio workflow visual designer active, drag a CodeActivity onto the designer s surface and drop it into the right-hand branch of IfElseActivity1.
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Part II
Working with Activities
7. Assign the code activity s ExecuteCode property the value of NegateQ1. When Visual Studio inserts the NegateQ1 event handler and switches to the code editor, again return to the workflow visual designer to drag one more activity onto the designer s surface.
8. Repeat steps 6 and 7, but this time drop the code activity into the left branch of IfElseActivity1.
Assign its ExecuteCode property the value AffirmQ1. However, when Visual Studio inserts the AffirmQ1 event handler, do not switch back to the workflow visual designer. Instead, it s time to add some code.
9
Logic Flow Activities
9. We now need to add some properties to the workflow class that we can assign as parameters when we start our workflow processing. Following the Workflow1 constructor, add the following lines of code to contain the three questions the workflow will ask:
private string[] _questions = null; public string[] Questions { get { return _questions; } set { _questions = value; } }
10. We also need to add the Dependent property, which is used to tell whether the questions are or are not independent of one other. After the code you inserted in the preceding step, add the following:
private bool _dependent = true; public bool Dependent { get { return _dependent; } set { _dependent = value; } }
11. The question responses, as Boolean values, need to be stored somewhere until returned to the host application. Therefore, following the Dependent property you just inserted, add this field:
private bool[] _response = null;
12. The _response field is uninitialized, so locate the Workflow1 constructor and add this code after the InitializeComponent method invocation:
// Initialize return vector. _response = new bool[3]; _response[0] = false; _response[1] = false; _response[2] = false;
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